Warning: require(vendor/autoload.php): failed to open stream: No such file or directory in C:\xampp_5\htdocs\website\sp\lib\PHPMailer\get_oauth_token.php on line 59

Fatal error: require(): Failed opening required 'vendor/autoload.php' (include_path='C:\xampp_5\php\PEAR') in C:\xampp_5\htdocs\website\sp\lib\PHPMailer\get_oauth_token.php on line 59